By this way,not only the disturbed "blocking effects" which always lies in traditional DCT algorithm can be reduced,but the coding rate can be increased without losing any coding quality than other hierarchical DCT zerotree coding as well.

This paper discusses the theory and way to reduce blocking effects.

A loop-filter for removing the block effect based on the characteristics of variable length coding and the corresponding principle of picture character behavior both in time and frequency domain was proposed.

Such defects as the block effect and ring effect show up after the image is reconstructed.

Via simulation,"block effect" errors exist in the scheme.

In this paper,we propose an improving method of removing the blocking artifacts on images based on the theory of projections onto convex sets(POCS) in 3 to decrease the blocking effect.

This method can preserve the main structure of image, smoothing noise and removing discrete cosine transform blocking effects.

This paper firstly introduces the recent situation of digital television;and describes some typical matter in aspect of video compression,such as Mosquito noise and Blocking artifacts;then noise reducer technique followed,like preliminary smoothness process and MPEG Noise Reducer of Algolith company;finally advanced prospect of future.

In order to reduce the visible blocking artifacts at the block boundary with Block Discrete Cosine Transform(BDCT)at low bit rates,a new blocking-artifact reduction algorithm in DCT domain is presented in this paper.

A major drawback of block discrete cosine transform(BDCT) is that the decoded images,especially at very low bit rates,exhibit highly noticeable blocking artifacts near the block boundaries.